Anchor hoist with manual or motor drive

ABSTRACT

An anchor hoist with manual and/or motor drive in which the winch drum is rotatable upon its shaft and is coupled therewith by a servo-tightened cone-type clutch driven axially by a mechanism cooperating with a sleeve carried by the shaft. The tubular member or sleeve is provided with locking means for retaining it against rotation as the shaft is rotated and includes a camming arrangement for lifting a detent holding the sleeve against rotation.

United States Patent 1191 Uher 1451 July 10, 1973 ANCHOR HOIST WITHMANUAL OR MOTOR DRIVE [75] Inventor: Edmond Uher, Zug, Switzerland [73]Assignee: Uher Patent AG, Zug, Switzerland [22] Filed: May 1, 1972 [21]Appl. No.: 249,133

Related US. Application Data [63] Continuation-in-part of Ser. No.101,287, Dec. 24,

[30] Foreign Application Priority Data Apr. 29, 1971 Germany P 21 21017.3

[52] US. Cl. 254/187 R, 192/12 B, 192/19 [51] 1 Int. Cl 866d 1/00 [58]Field of Search 254/150 R, 187 R;

[56] Reierences Cited UNITED STATES PATENTS 3,391,907 7/1968 Vogelsang254/150 R 3,572,482 3/1971 Kalpas et a1 192/12 B Primary Examiner-EvonC. Blunk Assistant Examiner-Merle F. Maffei Att0rneyKar1 F. Ross [57]ABSTRACT An anchor hoist with manual and/or motor drive in which thewinch drum is rotatable upon its shaft and is coupled therewith by aservo-tightened cone-type clutch driven axially by a mechanismcooperating with a sleeve carried by the shaft. The tubular member orsleeve is provided with locking means for retaining it against rotationas the shaft is rotated and includes a camming arrangement for lifting adetent holding the sleeve against rotation.

10 Claims, 5 Drawing Figures PATENIEUJUL 1 mm sum 1 or 2 ANCHOR HOISTWITH MANUAL OR MOTOR DRIVE CROSS-REFERENCE TO RELATED APPLICATION Thepresent application is a continuation-in-part of my copendingapplication Ser. No. 101,287 filed 24 Dec. 1970 and entitled ANCHORHOIST.

FIELD OF THE INVENTION My present invention relates to an anchor hoist,windlass or capstan which may be driven by hand or by a motor forraising or lowering an anchor.

BACKGROUND OF THE INVENTION In my copending application mentionedearlier, there is described an improvement in the art of anchor-hoistmechanisms whereby manual and/or motor drive may be provided, via aclutch, to a windlass drum, pulley or sprocket to raise the anchorand/or control the lowering thereof. Prior to that development, therehad been proposed various meansfor elevating the anchor, including awindlass whose housing was mounted upon the deck of a ship and containeda drive mechanism which may be operated manually or by power means suchas an electric motor. The windlass drum was in the form of ananchor-chain sprocket adapted to draw in an anchor chain and lower itinto the hold, an anchorchain locker or a chest provided on orbelow thedeck. The anchor, fastened to an end of the chain is thereby raised.When the device is released, the anchor chain is paid out freely withgravity as the important propelling force.

To permit release of the anchor chain for free fall, or substantiallyfree fall, a clutch mechanism was provided. The drive for the windlassgenerally included a crank mechanism for rotating the sprocket and adevice for operating such clutch means. Because of the fact thatconsiderable effort was required to operate the clutch, these prior-artdevices were unsatisfactory. Thus it was an object of my earlier systemas described in application Ser. No. 101,287, to provide a mechanism forthe raising and lowering of an anchor, especially an anchor on a chain,whereby the strength necessary for operating the clutch could be reducedand, in general, the effort required for controlling the windlassdiminished. It was also desired to facilitate the raising and loweringoperation, to minimize the labor power and inconvenience which would berequired for this purpose, and to provide a hoist or winch which couldbe readily controlled and would be of low cost.

To achieve this result, the winch or hoist of the prior applicationcomprised a rotatable body (chain sprocket) engageable with the chainand rotatably mounted upon a drive shaft which was connected by suitablegearing with a drive source such as a manually operable crank and/or anelectric or hydraulic motor. The shaft carried one member of the clutchwhile the sprocket wheel was provided with the other member, ascrew-thread arrangement being provided between the first member and theshaft for axially shifting this member to engage the clutch. The screwthread, of course, represented any camming means for transforming therelative angular displacement of the axially shiftable clutch member andthe shaft into a linear displacement (along the shaft) for engagement ordisengagement of the clutch. The clutch-actuating system LII which wascapable of manual, electrical or hydraulic operation, included a lockingpawl engageable with the rotatable element connected with the axiallyshiftable member fof retaining same against angular displacement in oneposition to permit the aforementioned axial displacement and releasingthe element when rotation of the shaft and sleeve together was desired,e.g. when the anchor-chain sprocket was coupled with the shaft. Theengagement of disengagement of the clutch was effected by retaining orreleasing this element via the pawl while the clutch power or forcederived from the screw thread or cam arrangement as described.

The prior application also provided for a clutch system which includedan outer friction cone formed as a socket in the anchor-chain sprocketand widening in the direction of the housing from which the shaftprojected to carry the sprocket. The inner cone, converging axially inthe direction of the sprocket, was axially shiftable along the shaft butrotatably entrained therewith, e.g., via spline or key arrangement. Theclutchactuating system then comprised a sleeve mounted upon this shaftand bearing axially upon this shaft and bearing axially upon this innercone while being threadedly connected therewith to urge the frustoconestogether with a friction fit.

The sleeve was internally threaded to engage a mating thread on theshaft such that the sleeve and shaft are normally rotatable togetheralthough the shaft is axially fixed while the sleeve is axiallydisplaceable. One end of this sleeve is adapted to bear axially upon thebroad base of the inner frustocone to urge the same into frictionalengagement with the female frustoconical surfaceof the chain-sprocketwheel. Along the periphery of the threaded sleeve, moreover, andpreferably on a disk-shaped angular flange formed at an inner end of thesleeve within the housing, there was provided means for immobilizing thesleeve (angularly) relative to the shaft. This means could include afriction brake of the band, shoe or disk type, or a more positiveengagement means such as a plurality of recesses engaged by thehook-shaped end of a latching pawl swingable in a plane parallel to theplane of the disk and mounted on the housing. The engagement of thethreaded element with the pawl was arranged so as to permit axialdisplacement of the sleeve within the housing.

The housing was so constructed and arranged as to be flooded with oil sothat the only mechanisms external of the housing are the crank, theanchor and sprocket wheel and its clutch, and any electric or othermotor used to power the hoist. Typical of the other camming means whichcould be substituted for the screw-thread clutch actuator, were cammingarrangements of the slot and pin type. The screw thread had theadvantage that, with a number of turns being engaged simultaneously, theaxial stress is distributed.

The pawl was manually actuated by a lever having a handle locatedexternally of the assembly although fluid-responsive piston-and-cylinderarrangements and electrically energized solenoids are also described.The pawl is advantageously biased away from the toothed periphery of thedisk-shaped member by a spring.

The drive system was provided, as described earlier, with a crankshaftmounted in the housing and having externally thereof a crank with arelatively long lever arm. Within the housing the shaft of the crank isconnected by gear means with the drive shaft, advantageously including adriving gear on the shaft of the crank and a driven gear on thesprocket-wheel shaft. The gears may mesh directly, if counter-rotationof the shafts poses no problem or may be interconnected bydirection-changing means such as a toothed or cogged belt, a chain or anidler gear when unidirectional rotation of the two shafts is required.

It will be apparent that, while my prior system represented a majoradvance over the art with respect to the operation of the clutchmechanism, some considerable force nevertheless might have been requiredto release the locking pawl.

OBJECTS OF THE INVENTION The principal object of the present inventionis to provide an improved anchor hoist which will extend the principlessets forth in my copending application Ser. No. ll,287 and to provide,in accordance therewith, improvements in clutch-actuating arrangementstherefor.

Another object of the invention is to provide a lightweight andrelatively inexpensive anchor hoist which will more easily be operatedthan conventional structures and will not require as massive drivesystems as earlier arrangements.

Yet another object of the invention is to provide an anchor hoistrequiring less effect on the part of the operator.

SUMMARY OF THE INVENTION These objects and others which will becomeapparent hereinafter are attained, in accordance with my presentinvention which, while provided with many elements in common with thoseof my earlier application, is modified so that some of the prior-artdisadvantages may be avoided. More particularly, I have discovered that,when the shiftable cone of the clutch arrangement is angularly andaxially fixed to the clutch-actuating sleeve and the friction forcesacting upon the shiftable clutch member act in the same sense as thepawl, there is provided a servotightening of the clutch to the pointthat the frictional interengagement of the clutch members will sufficeto enable the anchor to be raised without any substantial effort on thepart of the operator.

The anchor hoist, according to the present invention, thus comprises, incommon with the anchor hoist of the earlier application, a housing whichmay be sealed and flooded with a suitable lubricant, a main shaftjournaled in this housing and having an end projecting therefrom, achain-sprocket wheel or other rotatable body engaging the anchor cable,rope or chain and rotatable on the aforementioned end of the shaft whilebeing axially fixed relative thereto and provided with a frustoconicalsocket forming one clutch member, and

an axially and angularly displaceable second clutch member mounted onthe shaft and receivable in the socket. The shaft also carries aclutch-actuating sleeve which, unlike the earlier system, does not onlybear upon the shiftable clutch member, but is angularly and axiallyfixed thereto. The portion of the sleeve within the housing is providedwith an outwardly extending annular flange having at least one formationengageable by a hook-shaped pawl pivotally mounted within the housing.In addition, the housing contains some drive means for the main shaft,e.g., in the form of a crankshaft coupled by appropriate gear, chain orbelt means to the main shaft and/or a motor operating on the main shaftby a worm and worm-wheel arrangement.

The pawl acts upon the sleeve to restrain angular displacement thereofwith the shaft in the clutchtightening direction and, according to theinvention, the load upon the sprocket wheel acts to resist displacementof the sprocket wheel in this sense as well. Hence the pawl may belightly applied to the flange as the shaft is rotated, e.g., in ananchor-lifting sense, to axially shift the sleeve and its clutch membertoward engagement with the sprocket wheel. As soon as contact isachieved between the clutch members, the friction developed acts in thesame direction as the pawl to resist angular displacement of the sleeveand allow the axial displacement to continue until the friction force isequal to the torque necessary to lift the chain. As soon as thisthreshold torque is achieved, the sprocket wheel, sleeve and shaft arefrictionally locked together and the anchor is raised. In practice, thepawl can be released as soon as frictional engagement commences. Thisservo-operation guarantees that no excess axial stress will be developedand that no strain will be applied to the motor beyond that which isnecessary to raise the chain. Motor overloads by failure to release thepawl are eliminated and the entire apparatus can be of smallerdimensions since it need not resist inadvertent axial stresses.

According to another feature of the invention, the cam means is providedat the flange of the sleeve to release the pawl once it has engaged theself-tightening or self-locking formation of the flange when the shaftis rotated in a clutch-disengaging sense. This cam means may include asurface on the flange or a camming disk mounted thereon and providedwith a finger engaging a finger of an entraining member fixed to theshaft.

DESCRIPTION OF THE DRAWING The above and other objects, features andadvantages of the present invention will become more readily apparentfrom the following description, reference being made to the accompanyingdrawing in which:

FIG. 1 is a vertical cross sectional view through the housing and otherparts of an anchor hoist according to the present invention;

FIG. 2 is a transverse vertical cross section through the hoist;

FIG. 3 is a detail sectional view of the main shaft showing means fordriving same from a motor;

FIG. 4 is a transverse cross section through this shaft representing adetail of FIG. 3, and illustrating the camming arrangement fordisplacing the pawl or latch member; and

FIG. 5 is a detailed view of the cam arrangement similar to FIG. 4 butwith the parts in another position.

SPECIFIC DESCRIPTION In the description below, various portions of theanchor hoist of the present invention fully described in my copendingapplication, Ser. No. 101,287, have not been illustrated or discussed indetail. It should be noted that the present improvement is directed toone portion only of such apparatus and that otherwise all of thestructure illustrated and described in the copending application may beprovided in the anchor hoist of the present disclosure as well. Forexample, in the prior application, I have described a crank arrangementwhereby the crank-rotated shaft is connected by a cogged belt to thedriven shaft of the winch sprocket. Furthermore, the crank of thatarrangement was provided with a crankshaft, a rod extending through thecrankshaft and a brake member of frustoconical configurationdisplaceable by this rod for disengagement from the housing, and aspring urging the brake mem ber into engagement with the housing. Thus,the crankshaft is locked by a friction brake when it is released by theuser.

In the prior application, I have also described manual means for drivingthe motor-driven shaft as an alternative to the motor drive. In thisarrangement, the main shaft carries a clutch which is keyed to the shaftand may be coupled by jaw-clutch elements with the worm wheel of themotor drive or may be disengaged therefrom. In the other position, ascontrolled by a lever, the clutch member may have its gear teeth engagedin an idler gear rotated by the crank through a gear carried thereby. Inthis arrangement, either motor power or hand power may be used.

Also in the aforementioned application, I disclosed means forfacilitating the lifting of the latch member or pawl on the rotatablemembers and/or means for remotely operating the winch or hoist. All suchmechanisms should be considered within the ambit of the presentdisclosure with the various parts used interchangeably with thosedescribed below.

In FIGS. 1 and 2 of the present case, however, I have shown a manuallyoperated anchor hoist which comprises a housing 1 adapted to be mountedupon a deck plate and which may be filled with oil or some otherlubricating substance. The housing 1 is provided in opposite walls withjournals for a main shaft 2, one end of which projects outwardly of thehousing and carries a sprocket wheel 3 adapted to engage the anchorchain for controlling the release thereof and raising the anchor. Thesprocket wheel 3 is axially fixed on the shaft 2 but is rotatablerelative thereto. The sprocket wheel 3 is formed with a frustroconicalrecess 3a diverging in the direction of the housing and thus openinginwardly, this frustoconical recess forming one of a pair of conetypefriction-clutch member. The other clutch member 4 is frustoconicallyconvergent axially in the direction of the sprocket wheel 2 and can bereceived therein. The frustocone 4 is shown to be keyed at 5 to aninternally threaded sleeve 6 projecting through the wall of the housing1 and axially bearing upon the frustrocone 4 to entrain the latter inthe axial direction, the key 5 prevents relative rotation and axialdisplacement of the frustocone and the sleeve.

The shaft 2 is provided with an external thread 7 engaging the internalthread 6a of the sleeve 6 so that, when sleeve 6 is angularly fixed,rotation of the shaft 2 relative thereto will axially advance or retractthe sleeve. The latter is provided, within the housing 1, with anannular flange 8 formed along its periphery with a recess arrangement 9adapted to be engaged by a latching pawl 10 for angularly restrainingthe sleeve 6. The pawl 10 is pivoted in the housing about the pin 10aand is urged in the counter-clockwise sense by a spring 10b anchored toan arm 100 of the pawl at a location 10d, the other end of the tensionspring is anchored at 10e. It will be apparent that the points 10d and10e define a line which can coincide with the axis of the pin 10a in adead-center" position of the pawl. When this imaginary line lies to theleft of the axis of rotation of the pawl the spring acts in thecounterclockwise sense to urge the pawl out of engagement with theflange 8. When, however, the pawl is displaced to swing the location 10dand the lines 10d 10e to the right of the axis of pin 10a, the spring iseffective to bias the pawl in the clockwise sense and hold it in anengagement with the flange. The pawl is provided with a lever 11external of the housing for manual release and engagement of the pawl.

The shaft 2 also carries a driven gear 12 which meshes with an idlergear 13 journaled on' a stud 13a in the housing. The idler gear ordirection-changing gear 13, moreover, is in mesh with the drive pinionl4 keyed to a shaft 15 journaled in the housing 1 parallel to the shaft2. The shaft 15 also projects from the housing and is provided on anouter portion with a crank 16.

According to the principles of the present invention, the flange 8 isprovided with a camming surface adapted to deflect the pawl 10 out oflocking engagement when the shaft 2 is rotated in a sense adapted toraise the anchor. The cam 9, 9a is effective to release the pawl.

In normal operation, assuming the anchor has been lowered and it isdesired to raise the same, the clutch 4 being engaged with the clutchsurface 3a of the sprocket wheel, the crank 16 is simply rotated torelease the pawl without causing relative rotation of the sleeve and theshaft so that the sprocket wheel 3 rotates with shaft 2 and lifts thechain. When it is desired to lower the chain, however, the pawl 10 isbrought into engagement with the flange 9 to hold the sleeve 6 as thecrank 16 is rotated to release the clutch member 3a and 4, therebypermitting the sprocket wheel 3 to rotate relatively freely as theanchor descends.

The servo operation of the device is a consequence of the frictionalengagement of the cone 4 with the sprocket wheel. Thus, when pawl 10 isheld against the recess 9 as shown in dot-lines in FIG. 2, the flange 8is held only by the light pressure applied by this pawl. The crank 16 isthen rotated to axially shift the sleeve 6 to the left, there being noload of significance on the shaft at this time. However, as soon as thecone frictionally engages the recess 30, the friction force is effectivein.

the same sense as the pawl 10 to retard the rotation of the sleeve 6,thereby allowing the clutch pressure to build up automatically to thepoint that the torque developed at the clutch is sufficient to raise theanchor. This servo operation is effective whenever the sleeve 6 isfrictionally retarded by engagement with the loaded sprocket wheel 3 ora relative rotation is permitted between the sprocket wheel 3 and theshaft 2. When the opposite rotation of the shaft 2 is desired to releasethe clutch, the crank is rotated until the steep crank 9a engages thehook of pawl 10, whereby the latch means retains the sleeve until theservo effect has loosened the clutch.

In FIGS. 3 through 5, I have shown an arrangement wherein a motor (e.g.,an electric motor) is used along with or in addition to a manual drive,for the sprocket wheel 103. In this embodiment, the housing isrepresented at 101 and receives the shaft 102 which, within the housing,carries a wonn wheel 25 driven by a worm 26 connected to the outer shaftof an electric motor as described in my copending application mentionedearlier.

In this embodiment, the flange 108 of the internally threaded sleeve106, which engages at thread 107 of the shaft 102, is fixed to theclutch cone 104 by a key arrangement represented at 105 and is formedwith notches or recesses 109 and 1090 as previously described. Thesenotches cooperate with a pawl 110 which may be rotated about the stud28.

The sleeve 106 is also formed with a cylindrical step 40 upon which acam disk 17 is mounted for limited angular displacement, the cam diskbeing held in place by a spring clip 41. The flange 108 is provided witha pin 20 received in a slot 19 of the cam disk 17 to allow angulardisplacement through about 30 as illustrated in FIG. 4. The flanks 27 ofthe cam disk 17 are so shaped that, in one position, the steep-flankformations 109a are exposed as shown in FIG. 4. Thus the hook-shaped endof pawl 110 may engage these formations 109a to positively retain theflange 108 against rotation. In the other position of the cam disk, theflanks 27 obstruct the formations 109a and serve to shift the pawl 110outwardly as illustrated in FIG. 5.

The pawl 110 can be manually displaced by a lever such as that shown at11 in FIG. 2, or electromagnetically by a solenoid acting upon the rod21.

The cam disk 17 is provided with an axially extending but eccentric pin18 which projects toward an entrainer 23 axially and angularly fixed tothe shaft 2. The entrainer 23 also carries an axially extendingeccentric pin 24 in the path of pin 18.

In the close condition of the clutch 103, 104, a space is providedbetween the pins 18 and 24 as will be apparent from FIG. 3. When theshaft 102 is rotated in a clutch-disengaging sense, the hook of pawl 110engages one of the formations 109a and restricts rotation of the sleeve106. The sleeve is thereby shifted axially to the right to disengageclutch member 104 from member 103. The pin 18 approaches and finallyengages the pin 24. At this point, the camming member 17 is therebyentrained with the shaft 102 (FIG. to drive the pawl 110 out'ofengagement with the steep-flank 109a. The flange 108 is thereby releasedand can rotate together with the shaft 102.

To close the clutch 3, 4 the shaft 2 is driven (by reversal of themotor) in the opposite direction and the pawl 110 is brought intoengagement with the flange. The pawl rests against thenon-selftightening formation 109 to restrain the sleeve 106 which isshifted to the left until the aforementioned servo operation tightensthe clutch to the desired extent. The pawl 110 may even be releasedduring this self-tightening operation and can be held in this positionby a friction spring bearing against the hub of this pawl.

For indicating the length of chain released, a counterarrangement may beprovided as described in the aforementioned application and can make useof a pulse generator 29, 30, e.g., a permanent magnet and a stationarycoil.

An important advantage of the present invention resides in the factsthat the tractive force at the sprocket 3 is limited only-by the maximumcapacity of the motor and the motor cannot be overloaded by applicationof the clutch. The servo-clutching arrangement will match any loadrequirements. The locked formations 9 and 109 are of thenon-selftightening type whereas formations 9a and 1090 areselftightening, i.e., will not release without some additional force aslong as the two parts are urged together in the tangential direction.

I claim:

I. An anchor hoist comprising a housing:

a hoist shaft journaled in said housing and having an end projectingtherefrom;

a hoist body engaging the anchor and rotatably mounted on said end ofsaid shaft while being formed with one clutch member;

a second clutch member mounted on said shaft end axially and angularlyshiftable thereon while being juxtaposed with the first clutch memberfor engagement therewith;

a clutch-operating sleeve mounted on said shaft and operativelyconnected with said second clutch member for axially displacing same;

motion changing means between said sleeve and said shaft for convertingrelative angular displacement of said sleeve and said shaft into arelative axial displacement thereof upon angular mobilization of saidsleeve, said sleeve being provided with at least one formation;

a locking pawl mounted on said housing and engageable with saidformation for retaining said sleeve against angular displacement; and

drive means for rotating said shaft, said sleeve being formed with atleast one camming surface for biasing said pawl out of engagement withsaid sleeve upon rotation of said shaft in a direction tending todisengage said clutch members from one another.

2. The anchor hoist defined in claim 1 wherein said sleeve is formedwith a flange in said housing, said formation selflockingly engagingsaid pawl.

3. The anchor hoist defined in claim 2 wherein said camming surfaceincludes a surface formed on said flange for lifting said pawl out ofengagement with said flange.

4. The anchor hoist defined in claim 2 wherein said camming surface isformed by a camming disk mounted on said sleeve and limitedly angularlydisplaceable relative thereto and means on said shaft engageable withsaid disk for entraining same to bias said pawl out of engagement withsaid formation.

5. The anchor hoist defined in claim 4 wherein said camming disk isprovided with an axially extending pin offset from said shaft, saidshaft being provided with an entrainer having an axially extending pinengageable with the pin of said disk.

6. The anchor hoist defined in claim 2 wherein said pawl is providedwith spring means for retaining said pawl in at least two operativepositions including a position wherein said pawl is out of engagementwith said flange.

7. The anchor hoist defined in claim 6 wherein said body is achain-sprocket wheel formed with an axially diverging frustoconicalrecess open toward said housing and forming said first clutch member,said sprocket wheel being axially fixed to said shaft but rotatablefreely on said end thereof, said second clutch member comprising a coneconverging frustoconically in the direction of said sprocket wheel, saidsecond clutch member being axially and angularly fixed to a portion ofsaid sleeve projecting outwardly from said housing.

8. The anchor hoist defined in claim 7 wherein said motion changingmeans includes mating screwthreads on said sleeve and said shaft.

9. The anchor hoist defined in claim 8 wherein said drive means includesa crankshaft journaled in said housing, gear means within said housingcoupling said crank shaft with the shaft carrying said sprocket wheel,and a crank mounted on said crankshaft externally of said housing.

10. The anchor hoist defined in claim 8 wherein said drive meansincludes a worm wheel on said shaft and a motor-driven worm meshing withsaid worm wheel. 4 I 0 8 IR

1. An anchor hoist comprising a housing: a hoist shaft journaled in saidhousing and having an end projecting therefrom; a hoist body engagingthe anchor and rotatably mounted on said end of said shaft while beingformed with one clutch member; a second clutch member mounted on saidshaft end axially and angularly shiftable thereon while being juxtaposedwith the first clutch member for engagement therewith; aclutch-operating sleeve mounted on said shaft and operatively connectedwith said second clutch member for axially displacing same; motionchanging means between said sleeve and said shaft for convertingrelative angular displacement of said sleeve and said shaft into arelative axial displacement thereof upon angular mobilization of saidsleeve, said sleeve being provided with at least one formation; alocking pawl mounted on said housing and engageable with said formationfor retaining said sleeve against angular displacement; and drive meansfor rotating said shaft, said sleeve being formed with at least onecamming surface for biasing said pawl out of engagement with said sleeveupon rotation of said shaft in a direction tending to disengage saidclutch members from one another.
 2. The anchor hoist defined in claim 1wherein said sleeve is formed with a flange in said housing, saidformation selflockingly engaging said pawl.
 3. The anchor hoist definedin claim 2 wherein said camming surface includes a surface formed onsaid flange for lifting said pawl out of engagement with said flange. 4.The anchor hoist defined in claim 2 wherein said camming surface isformed by a camming disk mounted on said sleeve and limitedly angularlydisplaceable relative thereto and means on said shaft engageable withsaid disk for entraining same to bias said pawl out of engagement withsaid formation.
 5. The anchor hoist defined in claim 4 wherein saidcamming disk is provided with an axially extending pin offset from saidshaft, said shaft being provided with an entrainer having an axiallyextending pin engageable with the pin of said disk.
 6. The anchor hoistdefined in claim 2 wherein said pawl is provided with spring means forretaining said pawl in at least two operative positions including aposition wherein said pawl is out of engagement with said flange.
 7. Theanchor hoist defined in claim 6 wherein said body is a chain-sprocketwheel formed with an axially diverging frustoconical recess open towardsaid housing and forming said first clutch member, said sprocket wheelbeing axially fixed to said shaft but rotatable freely on said endthereof, said second clutch member comprising a cone convergingfrustoconically in the direction of said sprocket wheel, said secondclutch member being axially and angularly fixed to a portion of saidsleeve projecting outwardly from said housing.
 8. The anchor hoistdefined in claim 7 wherein said motion changing means includes matingscrewthreads on said sleeve and said shaft.
 9. The anchor hoist definedin claim 8 wherein said drive means includes a crankshaft journaled insaid housing, gear means within said housing coupling said crank shaftwith the shaft carrying said sprocket wheel, and a crank mounted on saidcrankshaft externally of said Housing.
 10. The anchor hoist defined inclaim 8 wherein said drive means includes a worm wheel on said shaft anda motor-driven worm meshing with said worm wheel.